A secondary battery, a battery pack, and an electronic device

Abstract

The utility model provides a kind of secondary battery, battery pack and electronic device, the secondary battery includes: shell, electrode assembly, pole, sealing element and first insulating piece, shell includes end wall, end wall includes mounting hole;Electrode assembly is housed in shell;Pole is fixed to end wall and is electrically connected with electrode assembly;Pole includes first limit part, second limit part and column body part, column body part is worn in mounting hole;Sealing element is clamped between second limit part and end wall;Between the inner edge of sealing element and column body part forms installation gap;First insulating piece is at least partially filled installation gap, and hardness is greater than the hardness of sealing element;The outer edge diameter of first insulating piece filled into installation gap is greater than or equal to mounting hole diameter, sealing element inner edge diameter is greater than or equal to mounting hole diameter, and outer edge diameter is less than or equal to the outer edge diameter of second limit part.The utility model can improve the technical problem that the sealing performance between pole and shell in secondary battery is not good.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a secondary battery, battery pack and electronic device. Background Technology

[0002] In the manufacturing process of secondary batteries, the sealing performance between the terminals and the casing plays a crucial role in the battery's lifespan and safety. As the performance of secondary batteries continues to improve, the requirements for their sealing performance are also becoming increasingly stringent.

[0003] However, the terminal sealing structure of current secondary batteries on the market usually has poor sealing performance, which can easily lead to many safety problems, such as leakage and short circuits, thus failing to meet the sealing requirements of high-performance secondary batteries. Utility Model Content

[0004] This invention provides a secondary battery, a battery pack, and an electronic device to improve the technical problem of poor sealing performance between the terminals and the casing in existing secondary batteries.

[0005] This utility model provides a secondary battery, which includes: a shell, an electrode assembly, a terminal post, a sealing member, and a first insulating member. The shell includes an end wall with a mounting hole. The electrode assembly is housed within the shell. The terminal post is fixed to the end wall and electrically connected to the electrode assembly. The terminal post includes a first limiting portion located inside the end wall, a second limiting portion located outside the end wall, and a columnar portion connected between the first and second limiting portions. The columnar portion passes through the mounting hole. The sealing member is sandwiched between the second limiting portion and the end wall and surrounds the outer periphery of the columnar portion. An installation gap is formed between the inner edge of the sealing member and the outer peripheral surface of the columnar portion. At least a portion of the first insulating member fills the installation gap and abuts against the inner edge of the sealing member. The hardness of the first insulating member is greater than that of the sealing member. The outer edge diameter of the first insulating member filling the installation gap is greater than or equal to the diameter of the mounting hole, the inner edge diameter of the sealing member is greater than or equal to the diameter of the mounting hole, and the outer edge diameter of the sealing member is less than or equal to the outer edge diameter of the second limiting portion.

[0006] In one embodiment of the present invention, the first insulating member includes a first part and a second part. The first part is disposed between the first limiting part and the end wall. One end of the second part is connected to the second part, and the other end extends to the outside of the mounting hole and fills the mounting gap.

[0007] In one embodiment of the present invention, the first insulating member is disposed in the mounting gap, and the secondary battery further includes a second insulating member. At least a portion of the second insulating member is disposed between the first limiting portion and the end wall, and at least another portion extends into the mounting hole and abuts against the end face of the first insulating member facing the electrode assembly.

[0008] In one embodiment of the present invention, the inner edge of the first insulating member abuts against the outer peripheral surface of the column portion, the outer edge of the first insulating member abuts against the inner edge of the sealing member, and the diameter of the outer edge of the first insulating member is equal to the diameter of the mounting hole.

[0009] In one embodiment of the present invention, the inner edge of the first insulating member abuts against the outer peripheral surface of the column portion, the outer edge of the first insulating member abuts against the inner edge of the sealing member, and the diameter of the outer edge of the first insulating member is larger than the diameter of the mounting hole.

[0010] In one embodiment of the present invention, the first limiting part is a riveted flange structure, and the outer edge diameter of the first limiting part is greater than or equal to the outer edge diameter of the sealing element.

[0011] In one embodiment of the present invention, the secondary battery further includes a third insulating member, which is disposed between the end wall and the second limiting portion, and at least partially abuts against the outer edge of the sealing member.

[0012] In one embodiment of the present invention, the inner edge of the third insulating member is provided with a chamfer on the side facing the sealing member, and an annular cavity is formed between the chamfer and the end wall, and the sealing member is at least partially accommodated in the annular cavity after being squeezed and deformed.

[0013] This utility model also provides a battery pack, which includes the secondary battery of any of the above embodiments.

[0014] The present invention provides another electronic device, which includes the battery pack in the above embodiments.

[0015] The beneficial effects of this utility model are as follows: The secondary battery of this utility model, by setting a first insulating member between the seal and the terminal post, and making the inner edge diameter of the seal greater than or equal to the diameter of the mounting hole, and the outer edge diameter of the seal less than or equal to the outer edge diameter of the second limiting part, achieves the following advantages: Firstly, the first insulating member allows the inner edge of the seal to be moved away from the outer circumferential surface of the terminal post, thereby allowing the seal to avoid the position of the mounting hole in the radial direction. This enables the seal to be completely pressed between the second limiting part and the end wall, resulting in a larger effective sealing area between the second limiting part and the end wall, and also causing the seal to undergo more uniform compression deformation, thus improving the sealing performance of the seal and addressing the problem of poor sealing performance between the terminal post and the housing. Secondly, since the inner edge of the seal avoids the edge of the mounting hole, the probability of the edge of the mounting hole contacting the seal is reduced, thereby reducing the risk of the edge of the mounting hole damaging the seal and ensuring the structural integrity of the seal, thus improving the stability of the sealing performance between the terminal post and the housing. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram:

[0018] Figure 1 An axial cross-sectional view of a secondary battery provided in an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the electrode assembly in a secondary battery provided in one embodiment of the present invention;

[0020] Figure 3 for Figure 1 A magnified view of a portion of region A in the middle;

[0021] Figure 4 This is a schematic diagram showing the installation positions of the first insulating component, the sealing component, the pole post, and the end wall in one embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram showing the installation positions of the first insulating element, the sealing element, the pole post, and the end wall in another embodiment of the present invention.

[0023] Figure 6 for Figure 5 A schematic diagram of the specific structure of the installation gap after removing the first insulating component in the embodiment shown;

[0024] Figure 7 This is a schematic diagram showing the installation positions of the first insulating element, the sealing element, the pole post, and the end wall in another embodiment of the present invention;

[0025] Figure 8 for Figure 7 A schematic diagram of the outer edge dimensions of the first limiting part and the outer edge dimensions of the seal in the illustrated embodiment;

[0026] Figure 9 This is a schematic diagram of a structure in one embodiment of the present invention in which an annular cavity is provided between the third insulating component and the end wall;

[0027] Figure 10 for Figure 9 The diagram shown is a structural schematic of the embodiment after the seal has been removed.

[0028] Figure 11 This is a schematic diagram of the structure of a battery pack provided in an embodiment of the present invention;

[0029] Figure 12This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0030] The attached figures are labeled as follows:

[0031] 100. Secondary battery; 110. Casing; 111. End wall; 1111. Mounting hole; 112. Side wall; 113. Opening; 114. End cap; 120. Electrode assembly; 121. Positive electrode; 1211. Positive current collector; 1212. First coated area; 1213. First uncoated area; 122. Separator; 123. Negative electrode; 1231. Negative current collector; 1232. Second coated area; 1233. Second uncoated area; 124. Negative electrode tab; 125. Positive electrode tab; 130. Terminal post; 131. First limiting part; 132. Second limiting part; 13 3. Column part; 140. Seal; 141. Mounting gap; 151. First insulating component; 1511. First part; 1512. Second part; 152. Second insulating component; 1521. Body part; 1522. Boss part; 153. Third insulating component; 1531. Chamfer; 1532. Annular cavity; 1533. Annular groove; 15331. Groove sidewall; 15332. Groove bottom wall; 15333. Through hole; 200. Battery pack; 210. Housing; 211. First housing part; 212. Second housing part; 300. Electronic device; 310. Working part. Detailed Implementation

[0032] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0034] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0035] Please see Figures 1 to 12 This utility model provides a secondary battery 100, a battery pack 200, and an electronic device 300. The secondary battery 100, by providing a first insulating member 151 between the post portion 133 and the sealing member 140, allows the sealing member 140 to avoid the mounting hole 1111 in the radial direction, thereby being completely pressed between the first limiting portion 131 and the end wall 111. This increases the effective sealing area of ​​the sealing member 140 between the first limiting portion 131 and the end wall 111, improving the sealing performance of the sealing member 140 and addressing the problem of poor sealing performance between the terminal post 130 and the housing 110. Simultaneously, it reduces the probability of the edge of the mounting hole 1111 contacting the sealing member 140, thereby reducing the risk of the edge of the mounting hole 1111 damaging the sealing member 140 and reducing the risk of weakened sealing performance due to damage to the sealing member 140.

[0036] Please see Figure 1 In one embodiment of the secondary battery 100 of this utility model, the secondary battery 100 includes: a shell 110, an electrode assembly 120, a terminal post 130, a sealing member 140, and a first insulating member 151.

[0037] Please see Figure 1 The housing 110 includes an end wall 111 and a side wall 112 surrounding the end wall 111. As long as a stable sealing and electrical connection can be formed, the connection between the end wall 111 and the side wall 112 can be achieved in various ways, such as integral stamping, integral casting, or separate welding. The surrounding shape of the side wall 112 is not limited; it can be cylindrical or prismatic, or it can follow any other closed-loop contour that matches the end wall 111.

[0038] In this embodiment, the outer edge of the end wall 111 is circular, and the side wall 112 is cylindrical and surrounds the outer edge of the end wall 111. A circular opening 113 is formed at the end of the side wall 112 opposite to the end wall 111. A receiving cavity is formed within the housing 110 formed by the end wall 111 and the side wall 112 for accommodating the electrode assembly 120, electrolyte, and other necessary components of the battery.

[0039] Please see Figure 1 and Figure 2The electrode assembly 120 is disposed inside the housing 110 and is a component in the secondary battery 100 where electrochemical reactions occur. The housing 110 may contain one or more electrode assemblies 120. Exemplarily, in this embodiment, one electrode assembly 120 is disposed within the housing 110. The electrode assembly 120 includes an electrode sheet and a separator 122, which are wound to form a wound structure. Specifically, in this embodiment, the electrode assembly 120 includes a positive electrode sheet 121, a separator 122, and a negative electrode sheet 123 wound axially around the housing 110.

[0040] Please see Figure 2 The positive electrode 121 includes a positive current collector 1211 and a positive active material layer coated on the positive current collector 1211. A first coated area 1212 coated with the positive active material layer and a first uncoated area 1213 uncoated with the positive active material layer are formed on the positive current collector 1211. The first coated area 1212 and the first uncoated area 1213 are arranged along the axial direction of the housing 110. The first uncoated area 1213 extends to one end of the secondary battery 100 in the height direction to the outside of the separator 122 and is bent towards the axis of the housing 110 to form a stacked positive electrode tab 125.

[0041] The negative electrode 123 includes a negative current collector 1231 and a negative active material layer coated on the negative current collector 1231. A second coated area 1232 coated with the negative active material layer and a second uncoated area 1233 uncoated with the negative active material layer are formed on the negative current collector 1231. The second coated area 1232 and the second uncoated area 1233 are arranged along the axial direction of the housing 110. The second uncoated area 1233 extends to the other end of the secondary battery 100 in the height direction to the outside of the separator 122 and is bent towards the axis of the housing 110 to form a stacked negative electrode tab 124.

[0042] A separator 122 is disposed between the positive electrode 121 and the negative electrode 123 to isolate the positive and negative active material layers. Taking a lithium-ion secondary battery as an example, the positive current collector 1211 can be made of aluminum, and the positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative current collector 1231 can be made of copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The substrate material of the separator 122 can be polypropylene (PP) or polyethylene (PE), etc. To protect and insulate the electrode assembly 120, an insulating film can also be wrapped around the electrode assembly 120. The insulating film can be synthesized from PP, PE, polyethylene terephthalate (PET), polyvinyl chloride (PVC), or other polymer materials.

[0043] Furthermore, in this invention, the positive electrode tab 125 faces the end wall 111 or the opening 113, while the negative electrode tab 124 faces the other end of the housing 110. Please refer to [link / reference]. Figure 1 In this embodiment, the positive electrode tab 125 faces the end wall 111 and is electrically connected to the terminal post 130, making the terminal post 130 positively charged. The negative electrode tab 124 faces the opening 113, and the housing 110 is electrically connected to the negative electrode tab 124, thus making it negatively charged. However, in another embodiment, the negative electrode tab 124 can be connected to the terminal post 130, and the positive electrode tab 125 can be connected to the housing 110.

[0044] Please see Figure 1 The secondary battery 100 may further include an end cap 114, which is sealed and installed in the opening 113. The outer edge shape of the end cap 114 corresponds to the shape of the opening 113 and is connected to the side wall 112 to seal the opening 113. The installation method of the end cap 114 includes, but is not limited to, mechanical sealing or welding sealing. In this embodiment, the end cap 114 is sealed and plugged into the opening 113 by means of mechanical sealing.

[0045] Please see Figure 1 and Figure 3 The electrode post 130 is fixed to the end wall 111 and electrically connected to the electrode assembly 120. It should be noted that the end of the electrode post 130 facing the electrode assembly 120 can be directly electrically connected to the positive electrode tab 125 through the end wall 111, or it can be indirectly electrically connected to the positive electrode tab 125 through a current collector. Optionally, in this embodiment, a current collector is provided on the side of the electrode assembly 120 facing the end wall 111, and the electrode post 130 is electrically connected to the positive electrode tab 125 through the current collector.

[0046] Please see Figure 3 and Figure 4 The electrode post 130 includes a post body 133, a first limiting part 131, and a second limiting part 132. The first limiting part 131 and the second limiting part 132 are respectively disposed at both ends of the post body 133 in the height direction, and both extend from the outer periphery of the post body 133 to the outer periphery of the end wall 111 in the radial direction. The end wall 111 is provided with a mounting hole 1111, and the post body 133 passes through the mounting hole 1111. The end of the post body 133 facing the electrode assembly 120 is connected to the first limiting part 131, that is, the first limiting part 131 is located on the inner side of the end wall 111. The end of the post body 133 away from the electrode assembly 120 is connected to the second limiting part 132, that is, the second limiting part 132 is located on the outer side of the end wall 111. The cross-sections of the first limiting part 131 and the second limiting part 132 can be circular, square, prismatic, or other irregular shapes that can achieve stable conductivity, etc., and this embodiment does not limit them. Optionally, in order to facilitate the production and processing of the pole post 130, in this embodiment, the outer contours of the first limiting part 131 and the outer contours of the second limiting part 132 are both circular contours that are coaxially arranged with the pole part 133.

[0047] Please see Figure 4 The sealing element 140 is disposed on the outer side of the end wall 111 and sandwiched between the second limiting part 132 and the end wall 111. The sealing element 140 is disposed around the outer periphery of the column part 133, and an installation gap 141 is formed between the inner edge of the sealing element 140 and the outer peripheral surface of the column part 133. The installation gap 141 is an approximately annular gap disposed around the outer periphery of the column part 133, and the installation gap 141 is coaxially or substantially coaxially disposed with the column part 133.

[0048] At least a portion of the first insulating member 151 fills the mounting gap 141 and abuts against the inner edge of the seal 140. Specifically, within the mounting gap 141, along the radial direction of the column portion 133, one side of the first insulating member 151 abuts against the outer peripheral surface of the column portion 133, and the other side of the first insulating member 151 abuts against the inner edge of the seal 140. The diameter of the inner edge of the seal 140 is greater than or equal to the diameter of the mounting hole 1111, and the diameter of the outer edge of the seal 140 is less than or equal to the diameter of the outer edge of the second limiting portion 132.

[0049] It should be noted that, under the condition that the first insulating member 151 at least partially fills the mounting gap 141, in one embodiment, as... Figure 5 As shown, the first insulating member 151 may be completely accommodated within the mounting gap 141. In another embodiment, as... Figure 4The first insulating member 151 shown may also be partially located within the mounting gap 141 and partially extended to the outside of the mounting gap 141, for example, extending through the mounting hole 1111 to the space between the first limiting portion 131 and the end wall 111. This embodiment does not limit this.

[0050] Furthermore, the first insulating component 151 can be made of polypropylene (PP) or perfluoroalkoxy resin (PFA), and the second insulating component can be made of PP or PFA. The sealing component 160 can be made of EPDM rubber, fluorosilicone rubber, or fluororubber, but is not limited to these materials.

[0051] In this embodiment, a first insulating member 151 is provided between the seal 140 and the pole post 130. The hardness of the first insulating member 151 is greater than that of the seal 140. The outer edge diameter of the first insulating member 151, which fills the mounting gap 141, is greater than or equal to the diameter of the mounting hole 1111. The inner edge diameter of the seal 140 is greater than or equal to the diameter of the mounting hole 1111, and the outer edge diameter of the seal 140 is less than or equal to the outer edge diameter of the second limiting part 132. With this configuration, on the one hand, the hardness of the first insulating element 151 is greater than that of the sealing element 140. The outer edge diameter of the first insulating element 151, which fills the mounting gap 141, is greater than or equal to the diameter of the mounting hole 1111. This allows the pole post 130 to apply pressure to the sealing element 140 during the assembly of the end wall 111. After being compressed and deformed, the sealing element 140 still avoids the position of the mounting hole 1111 in the radial direction, so that the sealing element 140 can be completely pressed between the first limiting part 131 and the end wall 111. This not only obtains a larger effective sealing area between the first limiting part 131 and the end wall 111, but also allows the sealing element 140 to undergo relatively uniform compression deformation as a whole, thereby improving the sealing performance of the sealing element 140 and thus improving the problem of poor sealing performance between the pole post 130 and the housing 110. On the other hand, since the inner edge of the seal 140 avoids the edge of the mounting hole 1111, the probability of the edge of the mounting hole 1111 contacting the seal 140 can be reduced, thereby reducing the risk of the edge of the mounting hole 1111 damaging the seal 140. This ensures the structural integrity of the seal 140 and improves the stability of the sealing performance between the pole post 130 and the housing 110.

[0052] Please see Figure 4In one embodiment of this utility model, the first insulating member 151 includes a first portion 1511 and a second portion 1512. The first portion 1511 is disposed between the first limiting portion 131 and the end wall 111 to achieve insulation between the first limiting portion 131 and the end wall 111. One end of the second portion 1512 is connected to the inner edge of the first portion 1511, and the other end of the second portion 1512 passes through the hole wall of the mounting hole 1111 and the outer peripheral surface of the column portion 133, and extends to fill the mounting gap 141 outside the mounting hole 1111. This arrangement allows the first insulating member 151 to not only fill the mounting gap 141, but also to achieve insulation between the first limiting portion 131 and the end wall 111. Therefore, there is no need to provide other insulating members in the mounting gap 141, thereby reducing the number of parts, simplifying the installation process of the first insulating member 151, and improving the overall assembly efficiency of the secondary battery 100.

[0053] Please see Figure 5 In one embodiment of this utility model, a first insulating member 151 is disposed within the mounting gap 141, the inner edge of the first insulating member 151 abuts against the outer peripheral surface of the column portion 133, and the outer edge of the first insulating member 151 abuts against the inner edge of the sealing member 140. The secondary battery 100 also includes a second insulating member 152, which is disposed inside the housing 110 and surrounds the outer periphery of the column portion 133. The second insulating member 152 includes a body portion 1521 and a boss portion 1522, the boss portion 1522 being connected to the side of the body portion 1521 facing away from the electrode assembly 120. At least a portion of the body portion 1521 is sandwiched between the first limiting portion 131 and the end wall 111, one end of the boss portion 1522 is connected to the body portion 1521, and the other end extends into the mounting hole 1111 and abuts against the end face of the first insulating member 151 facing the electrode assembly 120.

[0054] In this embodiment, by providing a second insulating member 152 and extending it into the mounting hole 1111 to abut against the first insulating member 151, a separate arrangement of the first insulating member 151 and the second insulating member 152 is achieved. Compared to an integrated insulating member structure, the separate insulating member design allows the first insulating member 151 and the second insulating member 152 to be optimized according to their functional requirements. The structural design of the first insulating member 151 can more flexibly adapt to the size of the mounting gap 141, without being limited by the diameter of the mounting hole 1111. This allows the first insulating member 151 to better fill the mounting gap 141, improving its adaptability to the mounting gap 141 and thus better ensuring the sealing performance of the seal 140.

[0055] Please see Figure 5Based on the above embodiment with a second insulating member 152, in one embodiment of this utility model, the inner edge of the first insulating member 151 abuts against the outer peripheral surface of the column portion 133, the outer edge of the first insulating member 151 abuts against the inner edge of the sealing member 140, and the diameter of the outer edge of the first insulating member 151 is equal to the diameter of the mounting hole 1111. This arrangement ensures that the edge of the mounting hole 1111 of the end wall 111 is aligned or approximately aligned with the joint between the sealing member 140 and the first insulating member 151. When the end wall 111 is deformed by internal pressure, the displacement direction of the edge of the mounting hole 1111 is consistent with the cracking direction of the joint, and the deformed edge of the hole can be smoothly embedded into the joint. This design can both prevent the edge of the mounting hole 1111 from cutting the sealing member 140 and prevent it from damaging the first insulating member 151.

[0056] Based on the above embodiment which includes a second insulating element 152, further please refer to... Figure 7 In one embodiment of this utility model, the inner edge of the first insulating member 151 abuts against the outer peripheral surface of the column portion 133, and the outer edge of the first insulating member 151 abuts against the inner edge of the sealing member 140. Furthermore, the diameter of the outer edge of the first insulating member 151 is larger than the diameter of the mounting hole 1111. Specifically, the diameter of the outer edge of the first insulating member 151 is D1, and the diameter of the mounting hole 1111 is D2, where D1 is larger than D2. This arrangement allows an annular contact surface to be formed between the first insulating member 151 and the end wall 111. This annular contact surface increases the radial distance between the inner edge of the sealing member 140 and the edge of the mounting hole 1111. When the end wall 111 is deformed by internal pressure, the annular contact surface further reduces the probability of the edge of the mounting hole 1111 contacting the inner edge of the sealing member 140, thereby further reducing the risk of the sealing member 140 being damaged by the edge of the mounting hole 1111.

[0057] Please see Figure 8In one embodiment of this utility model, the first limiting part 131 is a riveted flange structure, and the outer edge diameter of the first limiting part 131 is greater than or equal to the outer edge diameter of the sealing member 140. Specifically, the outer edge diameter of the first limiting part 131 is D3, and the outer edge diameter of the sealing member 140 is D4, where D3 ≥ D4. This arrangement ensures that the entire sealing member 140 is clamped between the first limiting part 131 and the second limiting part 132, thereby achieving uniform and consistent pressure on the entire sealing member 140. This not only ensures that a large effective sealing contact area can be formed between the sealing member 140, the second limiting part 132, and the end wall 111, but also helps to maintain long-term stable sealing performance. At the same time, by setting the riveted flange inside the housing 110, the sealing member 140 and the riveted flange can be spaced apart, thereby reducing the damage to the sealing member 140 caused by the riveting force during the riveting process and helping to ensure the integrity of the sealing member 140 during the installation of the pole 130.

[0058] Please see Figure 9 and Figure 10 In one embodiment of this utility model, the secondary battery 100 further includes a third insulating member 153, which is disposed between the end wall 111 and the second limiting portion 132, and at least partially abuts against the outer edge of the sealing member 140. Specifically, the third insulating member 153 is provided with an annular groove 1533, which includes a groove sidewall 15331 and a groove bottom wall 15332. A through hole 15333 is provided at the center of the groove bottom wall 15332 for the electrode post 130 to pass through; the outer periphery of the second limiting portion 132 is accommodated in the annular groove 1533, the groove sidewall 15331 abuts against the outer peripheral surface of the second limiting portion 132, the groove bottom wall 15332 is located between the second limiting portion 132 and the end wall 111, and the hole wall of the through hole 15333 abuts against the outer edge of the sealing member 140.

[0059] By providing the third insulating element 153, insulation between the second limiting part 132 and the end wall 111 can be achieved. Simultaneously, since the third insulating element 153 can abut against the outer edge of the seal 140, it can provide radial limiting for the seal 140. This not only reduces the probability of excessive radial displacement of the seal 140 under pressure, thereby limiting radial deformation of the seal 140 and preventing excessive compression, but also reduces the probability of seal failure due to radial displacement during use.

[0060] Please see Figure 9 and Figure 10In one embodiment of this utility model, a chamfer 1531 is provided on the inner edge of the third insulating member 153 facing the sealing member 140. An annular cavity 1532 is formed between the chamfer 1531 and the end wall 111, and the sealing member 140 is at least partially accommodated in the annular cavity 1532 after being deformed by compression. Specifically, the chamfer 1531 is provided at the inner edge of the bottom wall 15332 of the groove, and is located on the side of the bottom wall 15332 of the groove facing the end wall 111. The chamfer 1531 can be in various forms such as bevels and rounded corners. In this embodiment, the chamfer 1531 is a bevel structure.

[0061] The seal 140 may be at least partially contained within the annular cavity 1532 due to deformation caused by pressure during installation, or it may be deformed and contained within the annular cavity 1532 due to pressure from the housing 110 during use, causing the end wall 111 to compress the seal 140.

[0062] In this embodiment, by providing an annular cavity 1532 between the third insulating member 153 and the end wall 111, and by having the sealing member 140 at least partially accommodated in the annular cavity 1532 after being compressed and deformed, the sealing contact area between the sealing member 140 and the third insulating member 153 and the end wall 111 can be further increased, thereby improving the sealing performance of the sealing member 140 at this position.

[0063] Please see Figure 11 In one embodiment of the battery pack 200 of this utility model, the battery pack 200 includes a housing 210 and at least one secondary battery 100. The housing 210 includes a first housing portion 211 and a second housing portion 212, which cover each other to form a receiving space. Multiple secondary batteries 100 are housed within the receiving space, and the multiple secondary batteries 100 can be connected in series and / or in parallel. The battery pack 200 can be, for example, a battery module, a battery pack, etc.

[0064] Please see Figure 12In one example of the electronic device 300 of this utility model, the electronic device 300 includes a working part 310 and a battery pack 200. The working part 310 is electrically connected to the battery pack 200 to obtain electrical power. The working part 310 can be a unit component capable of obtaining electrical power from the battery pack 200 and performing corresponding work, such as a fan blade rotation unit, a vacuum cleaner suction unit, or a wheel drive unit in an electric vehicle. The electronic device 300 can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This utility model embodiment does not impose special limitations on the above-mentioned electronic device 300. In one embodiment of the electronic device 300 of this utility model, the electronic device 300 is a vehicle, the working part 310 is the vehicle body, and the battery pack 200 is fixedly installed on the vehicle body, thereby providing driving force for the vehicle to operate.

[0065] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A secondary battery, characterized in that, include: A housing, the housing including an end wall, the end wall including a mounting hole; Electrode assembly, housed within the housing; An electrode post is fixed to the end wall and electrically connected to the electrode assembly; the electrode post includes a first limiting part located inside the end wall, a second limiting part located outside the end wall, and a column part connected between the first limiting part and the second limiting part, the column part passing through the mounting hole; A sealing element is sandwiched between the second limiting portion and the end wall, and is arranged around the outer periphery of the column portion; an installation gap is formed between the inner edge of the sealing element and the outer peripheral surface of the column portion. A first insulating element, at least a portion of which fills the mounting gap and abuts against the inner edge of the seal, wherein the hardness of the first insulating element is greater than that of the seal; Wherein, the outer edge diameter of the first insulating member filling the mounting gap is greater than or equal to the diameter of the mounting hole, the inner edge diameter of the sealing member is greater than or equal to the diameter of the mounting hole, and the outer edge diameter of the sealing member is less than or equal to the outer edge diameter of the second limiting part.

2. The secondary battery according to claim 1, characterized in that, The first insulating member includes a first part and a second part. The first part is disposed between the first limiting part and the end wall. One end of the second part is connected to the first part, and the other end extends to the outside of the mounting hole and fills the mounting gap.

3. The secondary battery according to claim 1, characterized in that, The first insulating member is disposed within the mounting gap. The secondary battery also includes a second insulating member. At least a portion of the second insulating member is disposed between the first limiting portion and the end wall, and at least another portion extends into the mounting hole and abuts against the end face of the first insulating member facing the electrode assembly.

4. The secondary battery according to claim 3, characterized in that, The inner edge of the first insulating member abuts against the outer peripheral surface of the column portion, the outer edge of the first insulating member abuts against the inner edge of the sealing member, and the diameter of the outer edge of the first insulating member is equal to the diameter of the mounting hole.

5. The secondary battery according to claim 3, characterized in that, The inner edge of the first insulating member abuts against the outer peripheral surface of the column portion, the outer edge of the first insulating member abuts against the inner edge of the sealing member, and the diameter of the outer edge of the first insulating member is larger than the diameter of the mounting hole.

6. The secondary battery according to claim 1, characterized in that, The first limiting part is a riveted flange structure, and the outer edge diameter of the first limiting part is greater than or equal to the outer edge diameter of the sealing element.

7. The secondary battery according to claim 1, characterized in that, The secondary battery also includes a third insulating member, which is disposed between the end wall and the second limiting portion, and at least partially abuts against the outer edge of the sealing member.

8. The secondary battery according to claim 7, characterized in that, The inner edge of the third insulating member is chamfered on the side facing the seal, and an annular cavity is formed between the chamfer and the end wall. The seal is at least partially accommodated in the annular cavity after being squeezed and deformed.

9. A battery pack, characterized in that, The secondary battery includes any one of claims 1 to 8.

10. An electronic device, characterized in that, Includes the battery pack as described in claim 9.

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